Pump seal



Jan. 28, 1930. R N 1,744,971

' P'UMP SEAL Filed May 24, 1.929

I "a O O O G IIyVENTOR. Jo n Ifizyan.

HIS ATTORNEY Patented Jan, 28, 1930 UNITED STATES PATENT oFFic1:-,

JOHN KIRGAN, or ms'ron', PENNSYLVANIA, ASSIGNOR To, rnennsonnnann COM-IPANY, JERSEY CITY, NEW J ERSE PUMP Application filed May 24,

This invention relates to an apparatus for condensing steam or othergases and more particularly to a means for conducting air leakage from acondensate pump actuating element to an air removing device for thepurpose of preventing air at atmospheric pressure entering the condensersystem through the pump actuating element stufiing box and mingling withthe condensate in the condensate pump.

Such leakage is undesirable particularly in a steam condenser as ittends to decrease the operating efficiency of the boiler and to impairthe condensing efficiency of the condenser owing to the reduction of thevacuum in the condensing system.

An object of the invention is to prevent such air leakage. A furtherobject of the invention is to permit a comparatively loose pump seal,thereby reducing the power loss and wear of parts due to friction. Otherobjects of the invention are obvious or will be pointed out hereinafter.0

A preferred embodiment of the invention by which these objects may beattained is 11- lustrated in the accompanying drawing, in which, similarnumerals refer to similar parts;

Figure 1 is a side elevationof a steam condenser installation with partsof the bottom of the condenser, condensate outlet, air outlet andcondensate pump actuating ele-- ment broken away and shown in section.

Figure 2 is an oblique sectional view of an intermediate stuffing boxgland for the condensate pump shaft.

Figure 1 shows a surface condenser 1 in which vapor coming from asuitable source such as an engine (not shown) 1s condensed and whencecondensate flows through the condensate outlet 3, through conduit 4:into a condensate pump 5 and is returned through a conduit (not shown)to the boiler (not shown). An air removal device 7 of any desired typeis connected by a condu t 8 to the air outlet 22, which connects withthe condensate outlet 3. Condensate pump 5 is driven by a pump actuatingelement such as a shaft 9 which is rotated by a motor or other suitablepower device 10 and supported YL'A CORPORATION or new JERSEY SEAL 1929..Sara No. 365,617.

in bearings 11. Surrounding the shaft at I the place where it enters thecondensate pump casing-14 is a driving sleeve 12 which rotates with theshaft in a stufling box 23, in Which aplurality of packing rings 18 andan intermediate drainage gland 2' are held in position by a packinggland 15. The

drainage. gland 2 which may beplaced midway of the stufling box is shownin more de' tailvin Figure 2 and may be built up of two sections ofidentical construction. Each of these sections consists of one-halfof acircular band-which is grooved for the greater part ofits width on itsinside and outside surfaces as at 30 and 31 respectively, leaving twooutsiderings 16 connected by a web 17 which is perforated by a pluralityof holes 18.

Owing to the high vacuum maintained at thc suction chamber 32, air tendsto pass along the shaft 9. and into-the pump 5. Such air is atatmospheric pressure and leaks along the surface of the driving sleeve12 through the packingrings 13 until it reaches the gland 2. The air isdrawn up to the air removal device 7 through a port 19 drilled throughthe condensate pump casing 14 and connects with the cut-out portion 31of the outer surface of the drainage gland 2. A suitable pipe 21 isfitted to the port 19 and connects with a port 20 drilled inthe casingof the condensate outlet 3 at a point which would be higher than thenormal level of the condensate and close to the air outlet 22.

The leakage air which reaches the inside surface 30 of gland 2, is drawnthrough the perforations 18 by the suction of the air removal devices 7so that the condensate pump is effectively sealed from air leakage atthis point. Pump 5 as shown in this instance is of the double opposedinlet type and accordingly similar stuffing boxes are provided at bothends of the shaft 9. Pipe 33 is arranged to connect the stuffing box atthe left side of the pump 5 (Figure 1) and in its functions is similarto pipe 21.

I claim:

1. In a vapor condensing apparatus, a condenser a condensate pump, anair removal device, an actuating element for the condensate pump, andmeans for conducting air leakage from the pump actuating element to theair removal device.

2. In a vapor condensing apparatus, a condenser, a condensate pump, anair removal device, a pump actuating element for the condensate pump,means for packing the pump actuating element, and means to conduct airleakage from said packing means to the air removal device.

3. In a vapor condensing apparatus, a condenser, a condensate pump, anair removal device, an actuating element for the condensate pump havingan air leakage path, and means for connecting the air removal device tothe air leakage path in the pump actuating element.

4. In a vapor condensing apparatus, a condenser, a condensate pump, anair removal device, an actuating element for the condensate pumpprovided with a packing chamber, a packing gland providing an open spacein the packing chamber of the pump actuating element, and means toconduct leakage air from said gland to the air removal device.

5. In a vapor condensing apparatus, a condenser, a condensate pump, anair removal device, an actuating element for the condensate pump, and apacking gland with communication between its inner and outer surfaceswhereby leakage air may be conducted from the pump actuating element tothe air removal device.

In testimony whereof I have signed this specification.

JOHN KIRGAN.

